If the place is blaming old bushings and suspension for the steering wheel being off centred, go back and ask why he aligned it with worn components.
Even having worn components won't cause the steering wheel to come out crooked....
The place is feeding a load of bulldust as an excuse for pee poor workmanship.
The wear I could only put down to too much toe in...
The specs Mort posted up, I wouldn't go too much by them.....
If you adjust to the outer limits of those specs, you'll end up with tyres shredded after 10,000K either on the inner or outer edge, depending on which limit you went for.
An alignment is done by reading tyre wear and adjusting according to how those tyres wore....